2005 E53 X5 - Charging system issues.

[Golfknar]

Purchased an e53 2005 and have been working on it since purchase. Lol but thanks to you all I’m feeling more confident. Haven’t worked on cars before this. But can’t afford to take it in. So a huge Thanks!

This time, parked with engine running listening to stereo, speakers go out, battery light comes on, then car goes nuts all lights go on, car slowly dies and only clicks when I try to start.

Got a jump it started, made it home and then all warning lights come on again, car dies slowly again. Wake up in the morning and the car started but within a few minutes battery light, all warning lights and dies.

I’m thinking it’s the charging system but the alternator was switched out per the guy I purchased from 2 years ago and a new battery a year ago. Could these have gone bad so soon? Could it be something else like a belt? I smelled burning rubber for a few days before this happened. Also, car is making a weird noise. I am going to put a multimeter on the alternator and the battery but not sure what other steps I can take to troubleshoot so I don’t just purchase the alternator and battery then find something else wrong.

Appreciate you all!